In order to get monthly NDVI image with max value from two 16 day-images, I used mosaick tool in ERDAS8.7 by choosing max function from "set overlap function" tool. But after doing this, when I see the value of output image using inquire curcior, the value is between 0-255. when I saw the layer info, the value of output image is within the range of NDVI image (-1 to 1). So What does it mean? What is the problem with output image? Can this way used to this process?